after having checked: the problem is not connected to hardware (battery, charger etc), it is in the software. however, i do not now how to solve it?after having checked: the problem is not connected to hardware (battery, charger etc), it is in the software. however, i do not now how to solve it?

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Ifthe laptop battery is more than 3 - 4 years old then the battery could be wornout. Rechargeable batteries have a finite number of charge and discharge cyclesand will lose their charge capacity over time, i.e. won't charge to 100% andgradually the charge reduces until the battery won't charge up atall.
ORThe battery shows a 100% charge but when the adapter is disconnected thebattery drops off to zero capacity in a very short time.
Ifthe battery drops to an unacceptable charge level then the battery needs to bereplaced.

The battery isn't charging, from what you describe. Sounds like a bent pin, or a bad charging circuit. Waranty should cover, unless it was dropped or 'abused,' assuming that it was a new present. Take a quick look at the battery connection.

If the Acer is brand new then it is under warranty. Take it back to where you bought the Acer and get it fixed under warranty. if you attempt to fix it yourself you will most likely void your warranty.

i had the same problem at first but all i did was buy a new battery and it worked fine, then when it happened again i just had to take out the battery and put it back in, then it worked, hope i helped.